prism spectrometer

spectrometer

[spek-trom-i-ter] /spɛkˈtrɒm ɪ tər/

noun, Optics.

1.

an optical device for measuring wavelengths, deviation of refracted rays, and angles between faces of a prism, especially an instrument (prism spectrometer) consisting of a slit through which light passes, a collimator, a prism that deviates the light, and a telescope through which the deviated light is viewed and examined.